Take-up mechanism for sewing-machines



2 SheetsSheet 1.

(No Model.)

B. THOMPSON.

TAKE-UP MECHANISM FOR. SEWING MACHINES.

Patented Sept. 4, 1888.

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(No Model.) 2 Sheets-Sheet 2.

R. THOMPSON. TAKE-UP MECHANISM FOR SEWING MACHINES. No. 389,026.Patented Sept. 4, 1888.

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ROSEXVELL THOMPSON, OF BRIDGEPORT, CONNECTICUT.

TAKE-UP MECHANISM FOR SEWiNGHVlACHlNES.

SPECIFICATION forming part of Letters Patent No. 389,026, datedSeptember a, 1888.

Application filed August 18, 1887. Serial No. 247261. (No model.)

.To all whom it may concern.-

Be it known that I, BosnwELL THoMrsoN, a citizen of the United States,residing at Bridgeport, in the county of Fairficld and State ofConnecticut, have invented a new and Improved Talte-Up Mechanism forSeWingMachines; and I do hereby declare the following to be afull,clear, and exact description of the construction and operation of thesame, reference being had to the accompanying drawings, making a part ofthis specification.

This invention relates to improvements in revolving-hooksewing-machines, in which a take-up mechanism is used to draw the longloop of thread through the fabric to complete the stitch after it hasbeen carried around the loose disk bobbin by the hook; and the object ofmy invention is to perform this operation with but little motion of thedevices which compose the takenp mechanism, so as to admit of a veryrapid vibration of the parts when the machine is run at a high rate ofspeed.

Another object of my invention is to control the upper thread near theneedle, so as to avoid the stretching of the same while drawing the loopthrough the fabric, and thus produce a uniform and even tension upon thestitch during the sewing operation. I attain these objects by themechanism illustrated in the accompanying drawings, in which- Figure lis a side elevation of a revolvinghook sewing-machine with my improvedtakeup mechanism attached to the needle-bar hearings, and showing theposition of parts when theloop is drawn through thefabric to complete astitch. Fig. 2 is a side view of the left portion of the machine only,showing the position of the devices which compose the takeup mechanismwhile the needle is in the fabric and the loop of thread is beingcarried around the disk bobbin by the hook. Fig. 3 is a front view ofthe left end of the machine with front slide-plate and bobbin-holderremoved, showing needle raised to nearly the highest point and the loopof thread carried past the vertical center of the disk bobbin ready tobe drawn up by the take-up mechanism. Fig. 4 is a detached view of theneedle, revolving hook, and

bobbin, showing the point of said hook entering the needle-thread. Fig.5 is also a detached view ofthe same devices, but showing the hookpartially revolved and carrying the loop of thread around the loose diski)Obbil1,Willl6 the needle has an upward movement. Figs. 6 and 7 areenlarged perspective views of the takeup device separate from themachine, showing the parts in same position as shown in Figs. 1 and 2.

Similar letters of reference indicate corresponding parts.

Of the original machine, A. is the bed, 8 the arm, and C G the upper andlower needle-bar bearings. D is the needlebar-actuating lever. E is theneedlebar. F is the presser-foot bar, and G is the presser-foot. H isthe revolving hook. I is the disk bobbin, and J is the bob bin-holder. Kis the main shaft, and L is the driving-pulley. M is a pitman connectingthe needle-bar-actuating lever with driving-shaft K. N is the feedbar. Ois the stitch-regulating bar, and P is the stitclrregulating knob. Qisthe spool of thread. It is the threadcheck, and S the tension-disks.

The take-up mechanism is composed of the followingnamed devices:

a is the body of the take-up, and is a narrow strip of metal, havingupon the extreme ends lugs b I), secured, respectively, to the upper andlower needle-bar bearings in the manner shown in the drawings. Into thebodya number of short round studs, 0 c c c, are inserted in such aposition that the upper set of studs may be on the right side of thevertical center and the lower set on the left side of the same, as shownin the drawings. Narrow and thin strips of metal, (1 d, are placed overeach set of studs to prevent the short loops of thread which passbetween said studs from slipping off the same.

6 is a plate of metal pivoted at the center to a stud, f, at the centerof the body a, and having upon the upper left side and lower right sidea series of projections, g g g g, suificientl y narrow to pass betweenthe studs 0 c c 0 when said plate is in a vertical position, as shown inFig. 2. Upon the extreme ends of said projections are secured a set ofshort round studs, h h h h, of such a length as to just pass under theplates (1 (1 over the stationary studs 0 0.

dis a small roll fitted to'turn upon a small screw at the top end of thebody a, over which the thread passes in its passage from thetension-disks to the take-up studs.

j is a hooked wire in the lower end of the body a, under which thethread passes in its passage from the lower takeup stud to the eye ofthe needle.

k is the take-up cam, having a slightly-irregular path on the peripheryof the same, and is secured to the main shaft.

Z is the take-up lever, which is operated by said cam,being pivoted toscrew-stud m on the arm of the machine.

a is a rod which connects the upper end of lever Z with the upper end ofthe vibrating take-up plate a, and communicates motion from the formerto the latter.

I will now describe the practical operation of my improved take'upmechanism with ref erence to the accompanying drawings.

The bobbin is first filled with thread, leaving two or three inchesunwound. It is then placed in the cavity of the hook with the threadwound in the direction in which said hook revolves, and thebobbin-holder secured in its proper position. The thread from the spoolon the top of the arm is then passed over the thread-check, then aroundthe tension-disks, theh through the coil of wire on the top of the arm,then over the small roll t. Then, with the vibrating plate 6 in avertical position, as shown in Fig. 2,.the thread may pass between theset of studs 0 0 c a and h h h h, so as to form a straight line to thehooked .wire j, under which it is passed. The needle is then raised bythe driving-pulley and the end of the thread passed through the eye ofthe same from right to left, leaving two or three inches of threadextending beyond the eye. The fabric to be sewed is now placed under thepresser-foot, and, with the stitchregulating mechanism properlyadjusted, the sewing operation is commenced by revolving thedriving-pulley in the direction indicated by the arrow drawn upon thesame. The path in cam is so formed and the same so secured to the mainshaft in its relation to the revolving hook and reciprocating needle-baras to cause the vibrating plate 0 to be in the vertical position shownin Fig. 2 while the eye of the-needle is below the fabric and the loopof thread brought down by said eye is being carried around the bobbin bythe revolving hook to about the position shown in Fig. 3, after whichthe plate 6 is drawn back to about the angle shown in Fig. 1, taking upthe loop of thread which is under the fabric during the remaining upwardmovement of the needle by means of the series of studs upon the body aand vibrating plate 0, the same causing a series of short loops, whichaggregately amount to the same length of thread as composes the longloop under the fabric to be taken up. Said plate is retained in thisangular position until the eye of the needle reaches the fabric in itsdownward movement, at which time it is brought to a vertical position,so that the thread may be slackened and forced through the fabric. bythe needle to be carried around the disk bobbin by the revolving hook,after which the vibrating plate is again drawn back to the angularposition to take up the loop of thread which is under the fabric, theabove-described operations being repeated for each successive stitch.

taken collectively, amount to the sum of the I long loop of threadrequired to pass around the disk bobbin, I am able, with but littlemotion of the take-up mechanism, to draw the required length of threadthrough the fabric to complete the stitch, and that by my peeuliararrangement of devices and movements I also avoid the stretching of thethread between the fabric and take-up mechanism any perceptible amount,in consequence of the short distance I have between the lowest stud ofthe latter and the stitch to be made upon the material.

Having now fully explained the construction and operation of my improvedtake-up mechanism, I. claim as new and desire to secure by LettersPatent- 1. The combination, with the stitch-form; ing and tensionmechanisms of a revolvinghook lock-stitch sewingmachine, of a takeupdevice located between said mechanisms and means for operating saidtake-up device, said take-up device consisting of a vertical stationaryplate having a central stud to which is pivoted a centrally-vibratingplate, each plate being provided with a series ofprojecting studs aboveand below said central stud, around which the thread may be alternatelypassed, the studs in the upper half of said stationary plate being atthe right and the studs in the lower half of the same being at the leftof the vertical center, the positions of the studs in the upper andlower halves of the vibrating plate being reversed with relation to saidvertical center when at rest and in avertical position, but arranged topass be tween the studs in the stationary plate when in motion,substantially as shown and described, for the object set forth.

2. In a revolving-hook lock-stitch sewingmachine, the combination of thevertical stationary plate a, central pivot, f, upper and lower sets ofstuds 0 c c c, centrally-pivoted IIO vibrating plate e, upper and lowersets of stitch-forming and tension mechanisms, substmls h h h h, alllocated between the stitchstantially as shown and described, for the0bforming and tension mechanisms of the majecl: set forth.

chine, connecting-rod u, vertically-vibrating ROSEYVELL THOMPSON. 5lever Z, peripheral path-cam 7c, and means Vibnesses:

for imparting motion to said devices, all con- H. A. THOMPSON,

sn'ucted and arranged to operate with said 1 CHAS. E. THOMPSON.

